The 30-year-old Israeli model held yoga poses as celebrity yoga instructor Chad Dennis offered alignment tips in a new video.
Bar wore a cropped long-sleeved grey top and grey leggings as she showed relaxing ways to integrate yoga and driving.
She climbed inside a black Buick four-door and settled into a 'seated mountain pose' as Chad in a voice-over urged equal inhales and exhales out of the nose.
The 2009 Sports Illustrated Swimsuit Issue cover model then stretched her neck as she pulled her ears over both shoulders.
Bar placed both hands on the hood of the car as she moved into the 'puppy dog' poses that stretches 'all the various muscle groups of the back'.
She also moved into a figure-four pose and a modified warrior one pose.
'How do we reset, recalibrate and reclaim what is rightfully ours?,' said Chad, who has been the personal yoga instructor of Maroon 5 frontman Adam Levine.
The video was part of Buick's new 24 Hours Of Happiness Test Drive campaign in which the test drive experience is complemented by sounds, smell and yoga.
A recent Harris Poll commissioned by Buick showed that 57 percent drivers were interested in learning how to lower stress levels while driving.
Bar previously was in a relationship with Hollywood heartthrob Leonardo DiCaprio that ended in May 2011.